Upper saw-guide for band-saw mills.



NW PATENTED SEPT. 12, 1905.

H. G. DITTBBNNBR. UPPER SAW GUIDE FOR BAND SAW MILLS.

APPLICATION FILED MAR.21,1904.

3 SHEETS-SHEET 1.

No. 799,150. PATENTED SEPT..12, 1905. H. G. DIT'IBENNBR.

UPPER SAW GUIDE FOR BAND SAW MILLS.

APPLIOATION TILED MAR. 21. 1904.

3 SHEETS-SHEET 2.

liven/9i. Z/WI/I/I N0. 799,150. PATENTED SEPT. 12, 1905. H. G.DITTBBNNBR.

UPPER SAW GUIDE FOR BAND SAW MILLS.

APPLICATION IILED MAR. 21. 1904.

3'SHEETSSHEBT 3.

WW, m 3

HERMANN G. DITTBENNER, OF MINNEAPOLIS, MINNESOTA.

UPPER SAW-GUIDE FOR BAND-SAW MILLS.

Specification of Letters Patent.

Patented Sept. 12, 1st 5.

Application filed March 21, 1904. Serial Nv 199.107.

Be it known that I, I-InnMANN G. Drr'rsnN- use, a citizen of the UnitedStates, residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in UpperSaw- (iuides for Band-Saw Mills; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

My present invention relates to band-saw mills, and has for its objectto provide improved means for vertically adjusting the upper saw-guidesthereof: and to the above ends the invention consists of the noveldevices and combinations of devices hereinafter described, and definedin the claims.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several views.

Figure 1 is a side elevation showing in diagram a band-saw mill andillustrating myinvention applied thereto. Fig. 2 is a front elevation ofthe parts shown in Fig. I, some parts being broken away and some partsbeing sectioned. Fig. 3 is an enlarged view in side elevation, showingcertain of the parts viewed in the same direction as in Fig. 1, someparts being broken away; and Fig. 1 is a view in front elevation,showing the parts illustrated in Fig. 3, viewing the same from the samedirection that they are viewed in Fig. 2.

The numeral 1 indicates a portion of the framework of the mill, an upperfloor thereof being indicated by the numeral 2 and a lower floor beingindicated by the line marked 3.

The numeral 4 indicates the bed, the numeral 5 the pedestahbrackets, thenumeral 6 the band-wheels, the numeral 7 the band-saw, the numeral 8 theupper saw-guide, and the numeral 9 the vertically-adjustablesaw-guidecarrying block of an ordinary band-saw mill, which block 9 ismounted in the usual way for vertical movements on guides 10, supportedby one of the pedestal-brackets 5.

In accordance with my invention I use as a motor for verticallyadjusting the upper sawguide a straight-line reciprocating steam orcompressed-air engine made up of a cylinder 11 and a piston 12, whichcylinder is anchored to the lower floor 3 and is provided with the usualsteam-chest 13, equipped with a suitable distribution-valve, the stem 14only of which is shown.

The piston 12 has an upwardly-projecting stem 15, to the end of which Iis secured a laterally-projccting bracket 16. The bracket 16 supports acounterweight 11, made up of a plurality of sections, through the centerof which. as shown, is passed a screw-threzuled rod 18. The sections ofthe weight 1'7 are clamped together and held on the rod 18 and to thebracket 16 by nuts 19 on said rod.

Mounted in bearings 20 at the base of the cylinder-casting 11 is aguide-sheave 21, and mounted in bearings 22, secured on an upperprojection of one of the pedestals 5, is a guidesheave 23. A cable 2i isattached at one end to the YPItICIIllX-tllllLlSttll)lOsaw-guidc-carrying block 9 and at its other end to the upper end of thescrew-rod 18. This cable 2a is passed over the upper guide-sheave 23.Another cable is passed under the lower guidesheave 21 and is attachedat one end to the lower end of the screw-rod 18 and at its other end tothe vertically-adjustable block 9. As shown, the cable 25 is passedthrough a vertical guide-tube 26, supported by the base 4 and by atransverse timber 27, which timber is supported in any suitable way. 24:and the scrc\\'-rod IS, and the adjustable block 9 constitute an endlessconnection.

The stem 14 of the distribution-valvc is attached to the lower end of along operatingrod 28, which rod,as shown, is extended upward through theguide-tube 2(3 and at its upper end is attached to an operating-lever29. This lever 29, as shown, is pivoted to a block 30, supported by oneof the guides 10. This bracket is formed with a pocket 31, in which isplaced a coiled spring 32 and a follower-cap 33. Between the spring 32and the cap 33 is a washer 34:. A bolt 35 is passed through the washer3i and the bottom of the pocket 31 and is provided at its lower end withstop-nuts 36, which work against the bottom of the pocket 31. The cap 33is supported by the spring and acts upon the lever 29. The spring is soset that normally the operating-lever 29 will stand in an intermediateposition. (llestshown in Fig. As is evident, the lever 29 normally restsloosely on the cap and may be lifted upward free from the said cap orforced downward against the tension of the spring 32 to manipulate thedistribution-valve and operate the engine. It is further evident that bythe movement of the stop-nuts 36 the distribution-valve may be set inany desired position.

The counterweight 17 should be set to conn- T he cables IIO terbalancethe vertically-adjustable block 9 and the upper saw-guide carriedthereby. It is of course evident that when the piston 12 andcounterweight 17 are moved upward the guide-block 9 and the uppersaw-guide 8 will be moved positively downward, while, on the other hand,when the said piston and counterweight are moved downward the said blockand upper saw-guide will be drawn positively upward.

With the above-described arrangement all the bulky parts of thesaw-guide-adjusting device are placed below the band-saw mill, and henceentirely out of the way. Nevertheless the said adjusting device isplaced under the easy control of the operator standing at the side ofthe mill. Furthermore, the said device is of simple construction,efficient for the purposes had in View, and of comparatively small cost.

It will of course be understood that the device described is capable ofmodification within the scope of my invention as herein set forth andclaimed.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as folows:

1. The combination with a band-saw mill having a vertically-adjustableupper sawguide, of a guide-sheave located above said upper saw-guide, aguide-sheave located below the base of said mill, an endless flexibleoperating connection attached to said upper saw-guide, one portionthereof being run over said upper guide-sheave, and another portionthereof being run under said lower saw-guide sheave, a counterweightinterposed in said flexible connection, a straight-line reciprocatingengine located below the base of said sawmill, with its piston attachedto said flexible operating connection, and an operating-lever locatedabove the base of said mill and operativel y connected to said engine,substantially as described.

2. The combination with a band-saw mill having a vertically-adjustableupper sawguide, of a guide-sheave located above said upper saw-guide, aguidesheave located below the base of said mill, an endless flexibleoperating connection attached to said upper saw-guide, one portionthereof being run over said upper guide-sheave, and the other portionthereof being run under said lower guidesheave, a counterweightinterposed in said flexible connection below the base of said mill, astraight-line reciprocating engine located below the base of said millwith its piston-rod directly attached to said counterweight, and anoperating-lever located above the base of said mill and operativelyconnected to the said engine, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

HERMANN G. DITTBENNER. WVitnesses:

ROBERT C. MABEY, F. D. MERCHANT.

